[aws] Set up RDS database

[kush-chandra]

Change Description

Fixes #<issue_number> (delete if N/A)

Brief description and justification of what this PR is doing.

Security Assessment

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• This change potentially impacts the Hail Batch instance as deployed by Broad Institute in GCP
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• This change cannot impact the Hail Batch instance as deployed by Broad Institute in GCP
  • The Impact Rating, Impact Description, and Appsec Review sections can be deleted

Impact Rating

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• This change has a high security impact
• This change has a medium security impact
• This change has a low security impact
• This change has no security impact

Impact Description

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• For none/low impact: a quick one/two sentence justification of the rating.
  • Example: "Docs only", "Low-level refactoring of non-security code", etc.
• For medium/high impact: provide a description of the impact and the mitigations in place.
  • Example: "New UI text field added in analogy to existing elements, with input strings escaped and validated against code injection"

Appsec Review

• Required: The impact has been assessed and approved by appsec

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